A firefighter works to extinguish a flare up on Monday, May 5, 2014, in Guthrie, Okla. Gov. Mary Fallin has declared a state emergency across Oklahoma after several wildfires broke out across the state, including a blaze north of Oklahoma City that destroyed at least a half dozen homes and left one man dead. (AP Photo/Nick Oxford)

GUTHRIE, Okla. (AP) — Forecasters are warning of critical fire conditions as crews battle a wildfire that has scorched more than 4.5 square miles in central Oklahoma.

The National Weather Service has issued a red flag warning for western and central Oklahoma until 10 p.m. Tuesday. Forecasters say temperatures could surpass 100 degrees with low humidity and gusts up to 45 mph.

Guthrie Fire Chief Eric Harlow says firefighters have contained about 90 percent of the blaze after winds died down overnight in the city about 35 miles north of Oklahoma City.

Harlow says the wildfire has destroyed at least 10 homes and left one person dead.

Forecasters say parts of Arizona, Colorado, Kansas, Texas, New Mexico and Utah are also at a high risk of wildfires Tuesday.